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Income Taxes: Effective Tax Rate Differences From Statutory Tax Rates (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal Statutory Rate	21.00%	21.00%	21.00%
State income tax (net of federal tax effect)	(0.80%)	0.50%	1.20%
Non-controlling interest	(1.00%)	(0.90%)	(1.20%)
Tax Credits	(6.20%)	(7.70%)	(8.40%)
Flow-through adjustments	(1.70%)	(1.40%)	(3.20%)
Amortization of excess deferred income taxes	(3.00%)	(2.50%)	(3.10%)
TCJA bill credits	0.00%	(0.40%)	(3.60%)
Other	0.20%	(0.10%)	0.10%
Effective Tax Rate	8.50%	8.50%	2.80%

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by Flow Through Accounting.

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Effective Income Tax Reconciliation, Amortization Of Excess Deferred Income Tax Expense

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Effective Income Tax Reconciliation, TCJA-Related Customer Billing Credits to its Customers, Percent

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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